Sand-cutting machine



1 '1 636168 J 927 o. A. BUTTERFIELD SAND cumue momma Filed Feb. 9, 19254 Sheets-Sheet 1.

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' 1,636,168 J o. A. BUTTERFIELD I I SAND CUTTING MACHINE Filed Feb. 9,1925 4 Sheets-Sheet 4 I IN V EN TOR. 27

Patented July 19, 1927.

OSCAR LBUTTERFIELD, or BATTLE CREEK, MICHIGAN.

SAND-CUTTING MACHINE.

Application filed February 9,1925. Serial No. 7,974.

The present invention relates to machines for cutting, mixing andkneading sand used for moulding purposes in metal foundries and embodiescertain features of construction whereby a maximum amount of work can besatisfactorily accomplished with a minimum of time and but little motivepower and expense.

The present invention has for an objectto provide a machine readilyoperable by two attendants and capable of going over a floorof sand andcutting, mixing and kneading the same, leaving the treated sand in aheaped row at the rear of the machine as the machine is moved over thefloor, the movement of the machine over the floor being accomplished bythe p culiar arrangen'ieutof the sand cutting blades.

The invention comprises a framework mounted on two major wheels'and twocaster wheels, the whole being journalled in relatively oppositepositions at the ends of the frame with the major wheels in ad vancedposition, the frame carrying a me. J taihc hood having arearwardly-disposed upwardly-inclincd hip, the sides of said hood beingparallel and forming skirting members along the sides of the machine,the forward part of the hood being disposed parallel with the axle tosaid major wheels, slightly curved downward between said wheels and openboth at its forward and rear extremities, a motor-driven sand-cut tingcylinder being journallcd between the axes of said wheels and'below saidhood,

and so disposed that it will cut sand in a downward direction as themachine is advanced over a sand floor and throw it in a mixed conditioninto a central position over which the machine travels, the arrangementof said hood facilitating the heaping of the treated sand in a rowat:the rear of the machine. l

The invention further contemplates providing a sand-cutting cylinderhaving an imperforate shell carrying peripheral radially-extendingspirally-arranged spading blades alternately spaced at the center of thecylinder, and sand-cutting knives spaced.

parallel in advance of saidbladeswith their cutting edges tangent to apath circumscribed by the heel of said edges and concentric beyond thesweep of the outer edges of said blades, the arrangement of both bladesand knives being designed to draw the treated sand to the center at therear ofthe machine.

The invention further contemplates journaling the sand cutting cylinderin bearings that will permit the frame to be warped in its travel overirregular ground without impairing the alignment of said cylinder in vthe gperation of the machine.

Theinvention still further has for its object to provide meansforadjusting the sand-cutting cylinder with respect to the ground overwhich it operates, said means including screw-threaded shafts operatingthrough frame extensions and engaging ends of brackets attached to themachine axle, said cylinder being journalled in said brackets. I

Still another object of the invention is to so place the motor forpropellingthe sand cutting cylinder that the machine may be readilycounterbalanced when it' is necessary to raise the cylinder at the rearof the machine by a tilting process in moving the machine from one floorto another and for transporting the machine on its major wheels.

Another object of the invention is to so arrange a handle across theforward side ofthe machine that the attendant may raise or lower saidhandle as may be expedient, and whereby when said handle is elevated andlatched at a certain. position, by depressing the handle the machine maybe tilted wholly on to its major wheels and be moved with ease.

The foregoing and other objects and advantages will be readily apparentto those familiar" with foundry practice where a thorough and efiectivetreating of the sand is necessary for moulding purposes.

In the drawings forming a part of this specification, Figure 1 is a sideview of an embodiment of my improved sand-cutting parts brokenaway todisclose the sand-cub.

tinrg cylinder.

ig.- 4 is a central section of the machine. Fig. .5 is a detail sideelevation of a bracketin which an end of the sand-cutting cylinder isjournalled, and shows a screwthreaded shaft and itsattachment forregulating said bracket in adjusting said cylinder.

Fig. 6 is anenlarged detail longitudinal section of a cylinder bearingand part of a cylinder head and its shaft.

Fig. 7 is a detail end view of a cylinder hearing.

I In the drawings, like marks of reference refer to corresponding orequivalent parts in the different views, in which A represents the majoror large supporting wheelsto my machine; B, the follower caster wheels;C, a metallic hood carried by a frame consistingof two angular side bars1, a centrally and upwai 'dly curved rear girt 2 and a forward crossgirt3; D, a. sand-cutting cylinder suspended on a shaft 4 below said -hoodin appropriate bearings 5 'arried at the ends of brackets 6, saidbrackets beingattached near opposite ends to anaxle 7 on which thewheels A are mounted; E,1a motor carried in'iniediately forward of theaxle .7 and connected to the sand-cutting cylinder by an appropriatelink .drive belt 8 operating on sprockets 9 and 10, respectively.

As shown, the motor is of the electric type. However a gas engine asmotive power would be satisfactory for the purpose.

The frame. side bars I extend beyond the axle 7 at their forward ends,at. which places a machine-directing handle .11 is pivotally connectedtosaid ends by side members 12 of said handle and stabilized in serratedcdgedbrackets 13 carried at the ends of saic bars.

Immediately at.t,he rear .of the axle 'T the cross-gilt 3 is mountedwith its ends slightly beyond the side bars 1,-and at the rear'o'i theframe a cross-girt 2 is carried. This girt. is bowed upward centrallyand its ends extend beyond the inwarc lly-curved ends of the side bars 1and are supported by the trailer casters l3. i

\i ithin the frame a hood C is carried. This hood is of sheet metal andat its rear end conforms to the up'wardlyrurved por- .tion of the girt 8and its sides project anew larly below said girt to a point near theground, its edges being disposed parallel ,to each other and forming:skirt for preventing sand cut by the cylinder from escaping at themachine sides. From the curved point of the .3 thehood tapers downwardlyand forwardly below the agile T to which it is attached by a strap 14.The forward end of the hood is disposed parallel with "the axis 7 and isspaced suiiicinily above sand bed. to pennitthe "machine to be movedover the bed after the castings"haveibeen shaken out. On both sides ofthe hood where the sand-cutt' 1g cylinder is received intothe machine,thejhood is cut away asshewn in Fig. i. The objectoffthis hood is tocatch the sand treated by the cylinder'and direct it into a heapec'l-uprow'at the central rear end of the machine in readiness for preparingmoulds, i

pivotally journalled at their lower ends to said brackets and operatedthrough threaded bearings at the ends of the cross girt l of the frame.

The bearings 15 are supplied with any appropriate anti-frictionmechanism, and as herein shown are titted with a well known type ofrollers for the purpose. These bearings are enclosed at their outer endsby means of a grooved ring 18 into which a retaining spring-coil 19 istitted, the outer portion of the coil being received into a concentricgroove formed in a bored-out portion of the bearing, both ends of saidbearings being protected from dirt by means of appropriate flexiblewashers 2O encircling the. cylinder shaft 4.

The sand-cutting cylinder D is journalled below and within the hood G tothe shaft 4: disposed parallel between the axes of the supporting wheelsand operates in the direction taken by the supporting, wheels whenmoving as indicated by the arrows. This cylinder comprises animpcrforatc shell, carrying upon its periphery a series ofradially-extending longitudinally-disposed sand-spading blades 21 and aof sandcutting' knives 22, the latter being, parallel to the former andat the outer edge; thereof, with the cutting edges in advance, thecutting edges of the knives being tangent to a heel of their bevelededges and concentric above a path circuniscril'ied by the outer edges ofthe sand-spading blades, whereby sand being operated on will be first.cut by the knives, then caught by the spading blades and from saidspad-ing blades be hurled in radiating directions rearwardly from thecylinder and for the most part be caught by the sloping sides of thehood I) and directed into a heaped-up row at the rear of the machine.

i preferred method of arranging the spading-blades and cutting-knivesonthe cylinder shell i to have them disposed spirally and terminate atthe center of it in equidistant unis-matched posit-ions with the outerends of both blades and knives forward of theinopposite ends, and withthe knives preceding the blades in the operatingzdirectionofthecylinder, whereby by the peculiar angularity of the spading bladesand sand-c ntting knivesytogether with the outwarc'lly-flaring hood, thesand will. be

worked towarda common center attherear of the mach ne andleft -]I1 aneat and uniform -ridge.

From the foregoing description, taken in connection with the drawings,the objects and advantages and general utility of my invention it isbelieved'will be apparent to those familiar with foundry practice.

In accordance with the provisions of the patent statutes I have setforth the principles of my invention and have shown a machine which Inow consider to represent the best embodiment thereof, but I desire tohave it understood that the mechanism illustrated may be modified andcarried out in various details other than herein shown and described,and I reserve the right to make such changes as would comewithin thespirit and scope of my invention without relinquishing my right thereto.I

Having set forth my invention, what I claim as new and desire to secureby Letters Patent, is

1. In a sand-cutting machine, the combination with a frame havingsupporting wheels on both sides thereof adapted to hold said frameuniform in distance from the path over which it is moved, adjustablebrackets suspended from said frame between said wheels, a sand-cuttingcylinder journaled in said brackets and between the axes of said wheels,means to rotate said cylinder, means to guide the movements of saidmachine, a hood carried by said frame over said cylinder adapted togather the sand into a sloping-sided ridge at the rear of the 1tnachineas said machine is moved over a floor of sand. i

2. In a sand-cutting machine, the combination with a frame havingsupporting wheels on both sides thereof adapted to hold said frameuniform in distance from the path over which it is'moved, of adjustablebrackets suspended from said frame between said wheels, a sand-cuttingcylinder journalled in said brackets between the axes of said wheels,means to rotate said cylinder, means to guide said machine in itsmoveients including an adjustable handle attached to the forward end ofsaid machine, a hood-carried by said frame over said cylinder adapted todirect the sand cut by said cylinder into a sloping-sided ridge at therear of said machine as the same is moved over a floor of sand.

3. In a sand cutting machine comprising a frame supported by fourwheels, two of said wheels being the leader or major wheelsand two beingfollower or caster wheels, the same being relatively disposed onopposite ends of said frame, a hood carried by said frame, said hoodforming a sand-directing guide having a rearwardly and upwardly disposedridge with tapering sides disposed parallel below the ends of said frameand open at its ends, the forward edge of said hood being disposedbetween said major wheels and curving downwardly, a sand-cuttingcylinder carried bysaid frame within and below said hood and journalledto rotate between the axes)v of said wheels, means to rotate saidcylinder ,including a motor arranged radially-disposed sandouttingblades and forwardly-disposed parallel s aced sand-cutting knivesdisposed with tieir cutting edges tangent'to a path circumscribed by theshells of the cutting edges of said knives, and a hood carried by saidframe over said cylinder adapted to direct the sand cut by said cylinderinto a heaped ridge at the rear of the machine as said machine is movedover a floor of sand. 1

5. In a sand-cutting machine, the combination of a frame comprising sidemembers and cross girts, an axle attached to said frame at one side ofsaid girts, supporting wheels journalled at the end of said axle,

the outer or rear of said girts being curved upward centrally, casterwheels mounted at the outer ends of said upwardly-curved cross girt, asand'cutting cylinder journalled within said frame parallel with saidaxle and betweensaid supporting wheels and said caster wheels, means torotate said cylinder, a hood disposed with its forward edge below saidaxle and parallel with said cylinder, said hood arranged to extendrearwardly and upwardly and to conform to the curve of said-rear girtand to extend down at its ends parallel with the line of' tread of. saidwheels and wholly cover said cylinder, whereby the treated sand inpassing from said cylinder will be conducted into a sloping-sided ridgeintermediate the tread of said. wheels in the operation of the machine,and a guiding handle connected with said machine in advance of saidsupporting wheels.

journalled in said bearings between the axes of said wheels, meansincluding a motor to rotate said cylinder, means including sorew-'threaded shafts connecting said frame with said brackets-to variablyregulate said cylinder to and from said frame, said bearings be ngcapable of oscillatory movement in it brackets whereby said cylinderwill be self-aligning in its bearings in the travel of said machine overuneven ground.

7. In a sand-cutting machine comprising a frame having side bars andcross girts, the side bars being disposed parallel at their forward endsand curving inwardly at their rear ends, a rear girt extending beyondthe inwardly-curved ends of the side bars and curved upwardlyintermediate its ends, a front girt extending beyond the side bars atthe juncture with their inwardly-curved portions a supporting aXledisposed across the side bars of said frame forward of said front girt,supporting wheels journalled at the ends-of said axle, caster wheelsmounted brackets from theends ofrsaid front girts,

means to rotate said cylinder, an adjustable guiding handle fordirecting the movement of said machine attached at the forward ends ofsaid side bars, and a sandgathering hood mounted in said frame over saidcylinder, said cylinder and said hood being so disposed as to gather thesand cut by said cylinder into a slopingided ridge at the rear of saidmachine as said machine is passing over a floor of sand.

8. In a sand-cutting machine, the combination of a sand-cutting cylinderhaving an imperforate casing and carrying peripheral extensions,radially-disposed sandsgading blades carried by said extensions,parallel and spaced cutting knives forward of said spading blades attheir outer edges, the cutting edges of said knives being tangent to apath circumscribed by the heel of said cutting edges, said blades andknives being alternately disposed with their outer ends in advance oftheir inner ends during the operating movement of the cylinder, wherebysand being cut will be directed in the path centrally to a plane overwhich ting edges tangent to a path circun'lscribed by the heel of saidcutting edges outside of said sandspading blades, whereby sand cut bysaid knives will be directed on to said blades and be hurled outwardlyto the rear of said machine.

10. In a sand-cutting machine, the com bination with a frame, an axlesupporting one side of said frame, of brackets suspended at oneiend onsaid axle, bearings carried by said brackets at their ends opposite totheir suspension, a sand-cutting cylinder mounted in said bearings,screw-threaded shafts operative through correspondingly formed threadedextensions of said frame and engaging said brackets near said hearingends whereby said cylinder may be adjusted in its relation to said frame11. In a sand-cutting machine, the combination with a frame and an axlecrossing said frame on whichits major supportin wheels are journalled,of a bracket hinged at either sideof saidframe to said axle andadjustably movable with respect to said frame at their opposite ends,bearings mounted in said brackets opposite to their hinged ends, a sandcutting cylinder jourvnalled in said bearings, said bearings being OSCARA. BUTTERFIELD.

